<!DOCTYPE html>
<html>
	<head>
		<style>
			/* 请在此处编写CSS样式 */
			.container{
				position: relative;
				display: flex;
				justify-content: center;
				align-items: center;
				width: 500px;
				height: 300px;
				background-color: lightgray;
			}
			.box{
				position: absolute;
				display: flex;
				justify-content: center;
				align-items: center;
				width: 200px;
				height: 200px;
				border: medium solid #000000;
				border-radius: 5%;
				background-color: coral;
			}
			#text{
				text-align: center;
				font-size: 24px;
				font-weight: bold;
				text-transform: uppercase;
			}
		</style>
	</head>
	<body>
		<div class="container">
			<div class="box">
				<p id="text">Hello, CSS!</p>
			</div>
		</div>
	</body>
</html>